Anonymous - Engineering And Mining Journal Volume 25 - New paperback - X555z

Anonymous - Engineering And Mining Journal Volume 31 - New paperback - X555z

Anonymous - S.A. Mining and Engineering Journal 26 pt.2 no.1343 - N - X555z

Anonymous - Engineering And Mining Journal Volume 33 - paperback or s - X555z

Anonymous - S.A. Mining and Engineering Journal 27 pt.1 no.1365 - N - X555z

Anonymous - S.A. Mining and Engineering Journal 25 pt.2 no.1284 - N - X555z

Anonymous - Mining and Engineering World Volume 27... - paperback or - X555z

Anonymous - American Journal Of Science Volume 40 - New paperback or - X555z